Sterling lost 0.8 percent to hit a session low of $1.5486 against the dollar, the lowest level in a week, pulled down by weakness as Spain's borrowing costs jumped to new highs.
More top news
A year ago the International Court of Justice ruled that Japan's decades-old whale hunt in the Antarctic should stop.
Shadow chancellor John McDonnell has backed a free vote for MPs on the issue.
Savers into the new scheme can expect rates as high as 4 per cent from some banks.